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The rocks formed when existing rocks change due to heat or pressure are
- a)Sedimentary rocks
- b)igneous rocks.
- c)metamorphic rocks.
- d)All of these
Correct answer is option 'C'. Can you explain this answer?
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The rocks formed when existing rocks change due to heat or pressure ar...
Answer:
Definition: Rocks formed when existing rocks change due to heat or pressure are called metamorphic rocks.
Explanation:
Metamorphic rocks are formed when existing rocks undergo physical and chemical changes due to heat and pressure. These changes occur deep within the Earth's crust. Here is a detailed explanation of each option:
A: Sedimentary rocks: Sedimentary rocks are formed from the accumulation and lithification of sediments, such as sand, silt, and clay. They are not formed from the changes caused by heat or pressure.
B: Igneous rocks: Igneous rocks are formed from the cooling and solidification of molten magma or lava. They are not formed from the changes caused by heat or pressure.
C: Metamorphic rocks: Metamorphic rocks are formed when existing rocks, either sedimentary or igneous, are subjected to intense heat and pressure. These changes cause the minerals within the rocks to recrystallize, resulting in a new rock with different physical and chemical properties.
D: All of these: This option is incorrect because sedimentary and igneous rocks are not formed from the changes caused by heat or pressure. Only metamorphic rocks are formed in this way.
Therefore, the correct answer is option C: metamorphic rocks.
Definition: Rocks formed when existing rocks change due to heat or pressure are called metamorphic rocks.
Explanation:
Metamorphic rocks are formed when existing rocks undergo physical and chemical changes due to heat and pressure. These changes occur deep within the Earth's crust. Here is a detailed explanation of each option:
A: Sedimentary rocks: Sedimentary rocks are formed from the accumulation and lithification of sediments, such as sand, silt, and clay. They are not formed from the changes caused by heat or pressure.
B: Igneous rocks: Igneous rocks are formed from the cooling and solidification of molten magma or lava. They are not formed from the changes caused by heat or pressure.
C: Metamorphic rocks: Metamorphic rocks are formed when existing rocks, either sedimentary or igneous, are subjected to intense heat and pressure. These changes cause the minerals within the rocks to recrystallize, resulting in a new rock with different physical and chemical properties.
D: All of these: This option is incorrect because sedimentary and igneous rocks are not formed from the changes caused by heat or pressure. Only metamorphic rocks are formed in this way.
Therefore, the correct answer is option C: metamorphic rocks.
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The rocks formed when existing rocks change due to heat or pressure ar...
Metamorphic Rocks:
Metamorphic rocks are formed when existing rocks, whether sedimentary or igneous, undergo changes in their mineral composition and texture due to high heat and pressure within the Earth's crust. This process, called metamorphism, transforms the rocks into new types of rocks known as metamorphic rocks.
Formation Process:
- Metamorphic rocks are formed when existing rocks are subjected to intense heat and pressure deep within the Earth's crust.
- The high temperatures and pressures cause the minerals in the rocks to recrystallize and reorganize, resulting in the formation of new minerals and textures.
- This process can occur over long periods of time, often millions of years, as the rocks are buried deep within the Earth's crust.
Examples of Metamorphic Rocks:
- Some common examples of metamorphic rocks include marble, slate, schist, and gneiss.
- Marble is formed from the metamorphism of limestone, while slate is formed from the metamorphism of shale.
- Schist and gneiss are both foliated metamorphic rocks, meaning they have distinct layers or bands of minerals due to the intense pressure during their formation.
Conclusion:
Metamorphic rocks are the result of the transformation of existing rocks under high heat and pressure conditions. These rocks exhibit unique mineral compositions and textures that differ from their original rock forms, making them distinct and valuable in understanding the geological history of the Earth.
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